The correct answer is A. Samuel asked Remiel where he usually went swimming.
In this sentence, Samuel is asking Remiel a question. The question is “Where do you usually go swimming?” This means that Samuel is asking Remiel to tell him where he usually goes swimming.
The other options are incorrect because they do not accurately reflect the meaning of the sentence. Option B is incorrect because it says that Samuel said to Remiel where he usually goes swimming. However, in the sentence, Samuel is asking Remiel a question, not telling him something. Option C is incorrect because it says that Samuel asked if Remiel usually went swimming. However, in the sentence, Samuel is asking Remiel where he usually goes swimming, not if he usually goes swimming. Option D is incorrect because it says that Samuel told Remiel where he usually had been going swimming. However, in the sentence, Samuel is asking Remiel a question, not telling him something.